If you are working in a hazardous area even your torch must be explosion-proof.
Intrinsically safe flashlights are required in areas where explosive gases, liquids, dusts or fibres are present. They are designed and certified not to give any source of ignition in hazardous environments.
Several different certifying agencies have developed standards for intrinsic safety and evaluate products for compliance. Examples in North America are the Mine Safety and Health Administration (MSHA) and Electrical Testing Labs (ETL). In the EU the standard for intrinsic safety certification is the ATEX directive, while in other countries around the world, including New Zealand and Australia, the IECEx standards are followed.
Three categories of hazardous materials have been designated and are in general use:
Class I is subdivided into groups A (acetylene), B (Hydrogen and butadiene), C (diethyl ether, ethylene, isoprene, and UDMH), and D (acetone, gasoline, lacquer solvent, styrene, propane, and natural gas).
Class II is divided into Groups E (metal dust), F (carbon black, coal, and coke), and G (flour, starch, and grain dusts).
All classes include two divisions. Division I covers electrical equipment directly exposed in an explosion atmosphere of the material of a specific group. Division II covers electrical equipment in an explosive atmosphere only when accident or fallout occurs, or in a properly vented direct exposure.
Qualification for a rating also qualifies the equipment as suitable for a lower class and group. For example: Class I equipment can be used in Class II and Class III applications with no restrictions
Applications where intrinsically safe torches are likely to be required: firefighting, mining, petroleum industry, chemical manufacturing, shipbuilding, foodstuffs processing, pharmaceuticals, power generation, water treatment, gas distribution, aviation and military.